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Simplifying 19d = 20d + -20 Reorder the terms: 19d = -20 + 20d Solving 19d = -20 + 20d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-20d' to each side of the equation. 19d + -20d = -20 + 20d + -20d Combine like terms: 19d + -20d = -1d -1d = -20 + 20d + -20d Combine like terms: 20d + -20d = 0 -1d = -20 + 0 -1d = -20 Divide each side by '-1'. d = 20 Simplifying d = 20
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